In the production of pigs, the use of feeds for a long time to add antibiotics, chemical synthetic drugs and hormone drugs, etc., for the prevention of health care and growth, especially the use of antibiotics, the more used, the more used, the more serious, not only cause serious The drug residues and ecological environment pollution, and the increased resistance of pathogens, the safety of animal foods and human health, should be of great concern to everyone. Healthy farming is a low-energy, low-pollution, low-emission aquaculture industry. This is a new model for the development of China's aquaculture industry. It is consistent with the national demand for building a resource-saving and environment-friendly society. Therefore, in the production of pigs, it is necessary to strongly advocate the addition of antibiotics and hormonal drugs in the feed. Microecological preparations, Chinese herbal preparations and new antibacterial drugs, namely cytokine preparations, can be used, which are safe, effective and easy to use. There is no drug residue, no drug resistance, and the safety of animal food can be guaranteed. This is the future direction of the aquaculture industry. Here are some comments on several issues concerning the use of animal microecological preparations in pig production for reference by colleagues. (1) The main function of animal microecological preparations 1. Improve the performance and feed utilization of pigs. The beneficial bacteria in the microecological preparation can produce a variety of biological active substances such as digestive enzymes, vitamins, organic acids and growth promoting factors, which is very important for improving the performance and feed conversion rate of pigs. The pigs fed the microecological preparations increased the weight gain by 12%-20% on average, increased the feed conversion rate by 10%, and increased the survival rate of piglets by 5%-10%, and the mortality rate was greatly reduced. It can promote sow estrus, prolong estrus, increase pregnancy rate and birth rate. 2. Improve the immunity and disease resistance of pigs. Various probiotics in microecological preparations can be inhibited by placeholders, adhesions, competitive rejection, nutrient competition, organic acids, bacteriocins, antimicrobial peptides, lysoric acid and hydrogen peroxide produced during growth. Eliminate harmful bacteria, maintain the micro-ecological balance in the intestinal tract of the body, and prevent the occurrence of various diseases of the digestive tract and respiratory tract. According to the research report, pigs using microecological preparations reduced the incidence of intestinal diseases by 25% and respiratory diseases by 50%. There are peptidoglycans on the cell wall of probiotics, which can stimulate the immune cells of the intestine to increase the number of local immune antibodies, which is beneficial to enhance the disease resistance of the animal body. Both immunoglobulin 1gA secreted by lactic acid bacteria and muramyl dipeptide (MDP) produced by mycobacteria can activate macrophages, induce cytokines in the body, enhance the activity of phagocytic cells and lymphocytes, and enhance the functions of humoral and cellular immunity. . 3. Improve the quality of animal products and produce green food. The microecological preparation has no toxic and side effects, no drug residue, no drug resistance, safe use, can promote the improvement of pork meat quality, reduce fat deposition, and is the best additive for producing green food. Sun Jianguang et al (2010) R & D report: the use of micro-ecological preparations produced by lactic acid bacteria to feed fattening pigs, the results showed that linoleic acid (C18:2), eicosadienoic acid (C20:2), peanut oleic acid ( C20: 4) and total polyunsaturated fat content (P>0.05). It is proved that it can improve the ketone body quality and muscle quality of fattening pigs to varying degrees. 4. Improve the ecological environment of pig farms. The microecological preparation is fixed in the intestine, on the one hand, inhibiting the reproduction of pathogenic bacteria (especially spoilage bacteria), and reducing the production and discharge of harmful toxic substances; on the other hand, the probiotics cooperate with the original normal flora in the gastrointestinal tract. Function, improve feed conversion utilization, reduce the conversion of protein ammonia and amine, reduce the generation and emission of harmful substances such as ammonia, hydrogen, helium, hydrogen sulfide, skatole, eliminate odor, reduce environmental pollution, and purify air quality. Generally, the nitrogen content in the pig house can be reduced by 10% to 25%, and the hydrogen sulfide can be reduced by 4% to 6%. Probiotics produce a large amount of organic acids, anti-biomass, etc. in the metabolic process, which has a strong inhibitory effect on the growth and reproduction of pests such as mosquitoes and flies, and can reduce the breeding of mosquitoes and flies. In pig farms using microecological preparations, the number of common mosquitoes can be reduced by about 90%. At the same time, the probiotics have obvious purification effect on the high concentration organic waste water of the pig farm. The microecological preparations currently used on the market include: lactic acid bacteria preparations, Bacillus preparations, fungal preparations and yeast preparations, etc., which are excellent strains, deep fermentation, centrifugation, concentration, low temperature freeze drying and microcapsules. Made of chemical coating, compounding and packaging, the product has high quality (composite type), good stability, long storage period, strong resistance to drying and heat resistance and resistance to external factors; reproductive capacity, production The ability of enzyme, acid production, strong ability to produce bacteriocin and antibacterial peptides; high content of live bacteria, free from the interference of stomach acid and bile, is the best substitute for antibiotics. 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